Lifting jack



Feb. l0, 1931. 1 J MIZER 1,791,828I

LIFTING JACK F'iled March l, 1950 Patented Feb. 1o, 1931 UNITED sTATEs uuarszsf PATENT oFFlcE JOSEPH J. mEB, 0F ELCHE, 'WIISCONSNQ ASSIGNOR '.lOl WALKER MANUFACTURING GOHPANY, OF RACINE, WISCONSIN, A CORPORATION 0F WISCONSIN unirme .non

Application filed flareh 1,

This invention relates to new and useful improvements in lifting jacks, and more particularly to improved means for securing together and holding in assembled relation the parts of a jack of; the screw type.

A common type of screw jack embodies a hollow standard, in which the lifting screw is movable vertically, the screw being threaded into the hub portion of a rotatable driving gear or other rotary driving member which is supported at the u per end of the standard. A suitable annular t rust bearing, preferably of the anti-friction type, is interposed between the driving gear and'up r end portion of the standard to support t e load while permitting relative rotation-of these parts. It is desirable that simple and easily applied means be provided for locking these several parts together to prevent separation after they have been assembled, without interfering with the necessary relative rotary movements of the parts. The present invention relates to an easily applied annular locking collar for performing this function.

The principal object of this invention is to provide an improved lifting jack of the type briefly referred to hereinabove and disclosed nore'in detail in the specifications which fol- Another object is to provide improved means for preventing separation of the relative removable parts of a lifting jack of the screw type.

Other objects and advantages/of this invention will be more apparent from the following detailed description of one approved form of jack built according to the principl of this invention. v

In the accompanying drawings:

Fig. 1 is a side elevation of the assembled jack, in lowered position.

Fig. 2 is a central vertical section through the upper end portion of the jack, with the lifting screw elevated. p

Fig. 3 .is a horizontal section, looking upward from the line 3 3 of Fig. 1.

Fig. 4 is a perspective view of the improved locking collar before it is applied.

In the present drawings wehave shown a 5 very simple form of single-screw jack, al-

1930. Serial No. 432,422.

though it will be apparent as the description proceeds that this invention` could be applied equally well to morev complicated forms of multiple-screw jacks. The standard is built up of aO pressed metal base 1 and a pair of similarpressed metal side frames 2 and 3. The side frames are formed lwith outwardly flanged lower ends 4 secured to base 1 by rivets 5. The side frames also have en. aging Y side flanges 6 which are secured toget er by a pluralit of rivets 7. The central portions of the si e frames are bowed outwardlyz as at 8, to each form half of the cylindrical channel for receiving the lifting screw 9, and each of the bowed portions 8 is formed with a vertical channel 10 adapted to receive one end of the guide pin 11 mounted in the lower end of lifting screw 9, whereby the screw is -prevented from rotating without interfering with its vertical movements.

Near the upper end of the standard, one pair of side flanges 6 are bowed out, as at 12, to form a socket for receiving the lower end of a downwardly inclined stud shaft 13, which is locked in place by means of a key or pin 14. A driving pinion 15 has its hub 16 rotatably mounted on shaft 13, the hub bei fr held in place by a collar 17-v at the upper 4er of the shaft. The outer end 18 of the hub is shaped for engagement by a suitable handle member, by means of which the driving pinion is rotated. i

The pinion `15 meshes with the teeth 19 of a driving gear 20 havin a central downwardly extending cylindrical hub portion 21 which is internall threaded to receive the lifting screw 9. he load is supported at the upper end of screw 9 by means of a rest 22 and this load is transmitted from screw 9 to the gear 20, which in turn is supported from the upper end of the standard through a suitable anti-frictionbearing comprising upper and lower race rings 23 and 24 and an annular series of balls or rollers 25 interposed between the two race members. The race rings 23 and 24 lit about the hub 21 of the gear 20, although the lower race rin 24 is adapted to rotate with relation to the ub.

The bearing assembly is non-separably l 15 surroun 25 and t be employed for this purpose. The riveted lange -26-in the example here .illustrated is a simple and economical means for holding' the bearing assembly in place on the. hub.

The upper end of the standard is cupped outwardl at 27 to -receive the {bearing assembly, t 's cu portion comprising a laterally extending iilinge or collar 28, upon which the lower race ring 24 is supported, and an upwardl 4extending collary 29 adapted to the assembled bearing members. This entire cupped portion of the standard is pressed into the u per end ortions ofthe two side frame members 2 an 3. p

The locking collar (shown in perspective in Fig. 4) ycomprisesa cylindrical portion 31 adapted to fit around the upper cylindrical portion 29 of the standard, an upper in# wardly extending annular lanve 32 adapted to engage over the upper end ci the standard e upper race ring 23, and a plurality of ears 33 projecting downwardly from the ring ortion 31 and adapted to e bent inwar y and clamped a alnst the supportin collar'or seat 28 at the ottom of the cuppe upper end of the standard.

In assembling this improved and simplified jack, the two pressed metal or stamped frame members 2 and 3 are riveted together and then riveted to the base plate 1., The

stud shaft 13 is inserted through the hub 16 of driving inion 15 and then the inner end of this shaft islinserted in the socket 12 of the casing and the securing pin 14 is inserted and riveted in place. The reduced upper end 35 40 Aof the screw 9 is inserted through the rest 22A and riveted in place, the screw is threadedinto the driving gear 20, andthe guide pin 11 driven through a suitable diametrical o ning provided therefor in the lower end o the screw 9. The locking collar 30 is then positioned over the hub of gear 20 and the assembled members of the anti-friction bearing are then slipped into place over the hub 21 and the lower end of the hub is riveted,

0 as indicated at 26, to hold the bearing members, and consequently the locking collar` 30 in non-separable relation to the driving gear. This assembly is now inserted into the upper end of the standard so that the bearing members will rest within the upper cupped end portion 27 of the standard, 'and the ears 33 are bent into'clamping position beneath the lower supporting flange 28 of the cupped o portion. .The jack is now assembled ready for use, and the parts are all held in non-separable relation, although the necessary relative movements are permitted. It will be seen that the jack consists of a few simple and economically constructed parts which are 'i double-screw jacks, in which anouter screw sleeve is threaded intothe drivin ear 20,

-and a supplemental screw is threa e within this screw sleeve'. It will be apparent that such jacks can be constructed in exactly the same manner as the single screw jack hereinabove described, although it maybe neces- Sary tov increase the size or proportions of end portion to receive and support the bearing, means for locking the parts together comprisin a 'clamping member engaged about the aring and cupped, portion of the standard. A l

2. In a lifting jack comprisin a standard, a rotatable driving member and an annular bearing to support the rotary member on the standard, the bearing being non-separably connected about the drivin member, and the standard being formed wii a cupped'upper end portion to receive and support the bearing, means for locking the parts together comprising an annular collar engaged about the cupped portion of the standard and having an inwardly'flanged upper end to en gage over the bearin on its lower end to ie clamped beneath the cupped portion of the standard.

a lifting screw, a driving gear formed with 'a downwardly extending hub internally threaded-to receive the screw a bearing assembly comprising a pair of annular race members adapted to engage aboutthe hub and an annular' series of antifriction mem-l bers interposed between the races, means for locking the bearing assembly'on the hub while .emitting relative rotary movement of the ub and lower race member, the upper end of the standard bein outwardly cupped to form a seat for the aring assembly, and means for locking the bearing4 assembly in the seat to prevent separation' of the parts.

4. A lifting jack comprising a standard, a lifting screw, a driving gear formed with a downwardly extendlng hub internally' threaded to receive the screw, a bearing assembly comprising a pair of annular race members adapted to engage about the hubP and an annular series of antifriction members interposed between the races, means for locking the bearing assembly on the hub while permitting relative rotary movement of the hub and -lower race member, the upper end `some of the parts to accommodate the extra and a plurality of ears form a seat for the of the' standard beingxputwardly cupped to bers interposed betweenthe races, the lower" form a seat for the arin assembly, and end of the hub being riveted outwardly to clamping means enfgaged a ut the cupped portion of the stan ard and the bearing assembl to prevent separation of the parts.

5. lifting jack comprising a standard, a lifting screw, a driving gear formed with a downwardly extending hub internally- 'threaded to receive the screw, a bearing assembly comprising a pair of annular race members adapted to engage about the hub and an annular series of antifriction members' osed between the races, meansfor lockinte ing t e bearing aembly on the hub while permitti relative rota movement of the hub and ower race mem r, the upper end of the standard be' outwardly cupped to ring assembly, and an annular locking collar adapted to surround the cupped upperend of the standard v the collar having an inwardly flanged up r end to enga e over the upper race mem r and a plurahty of ears on its lower end to be vclam ed under the cupped portion of the stan ard.

' 6. A lifting jack comprising a standard, a lifting screw, a driving gear formed with a downwardly extending hub internally threaded to receive the yscrew va bearing assembly comprising a pair o annular race members adapted to engage about lthe hub and an annular series of antifriction members interposed between the races, the lower end of the hub being riveted outwardly to hold the bearing .ammbly on the hub while rmitting relative rotary movement of the hiib and lower race member, the upper endof the standard being outwardly cupped to form.

a seat for the bearing assembly,l and means for locking the bearing assemblyA in the seat to lprevent separation of the partis.

A lifting jack comprising a standard,

a lifting screw, a driving gear formed with a downwardly extending vhub internally threaded to receive the screw, a bearing assembly comprising a pair of annular race members adapted to engage about the hpb `and an annular series of alitlfriction members interposed between the races, the lower end of the hub being riveted outwardly to hold the bearin assembly on the hub while permitting re tive rotary movement of the' hub and lower race member, the upper end of the standard being outyvardly cupped to form a seat for the bearing assembly, and clamping means en aged about the cupped portion of the stan ard and the bearing assembly to prevent separation 'of the` parta 8. A lifting jack comprising as tandard, a lifting screw, a driving 'gear kformed with a vdownwardly extending `hub internally threaded izo-,receive the screw a assembly comprising a pair of annular race members adapted to engage abutithe hub and an annular series of antifriction mem-l hold the bearing assembly on the hubfwhile.

permitting relative rotary movement/of the ub and'lower race member, the upper end of.

the standard .beingeoutwardly cu ped to form a seatA for .the aring assem 1y, and an vannular locking collar adapted to surround the cupped upper end of the standard, the

collar having an inwardly flanged upper endto engage over the upper race member and a plurality of ears on its lower end to be clam Aed under the cupped portion of the stan ard. v v

9. A lifting jack comprising a standard formed of a pair of similar pressed metal side lhub, a guide in in t e lower end ortion of the screw an engaging in the guide slot in the standard, a air of annular ball race members mounte about the hub of the driving gear, a series of ball bearings interposed between the races, the lower end of the hub being rivetedfoutwardly beneath the lower race member, the assembled antifriction bearing consisting of the balls and races being received withm the cu ped portion of the standard, and an annulhr locking collar adapted to surround the cupped up r end of the standard and having'an inwar y ilanged upper end engaging over the upper race member and aplurality ofears on its lower end whlch are bent in under the cupped pory tion of the standard.

1i).v A lifting jack comprising a standard, a liftlng member, a drivingl gear formed with 'a downwardlyt' extending ollow hub through which the li ing member is`verticall movable, driving connections between t e hub and lifting member, a bearing assembly comprising a pair of annularrace members adapted to engage about the hub and an annular' series of antfriction members interposed between the races, means for locking the bear v assembly on the hub while permltting re ative rotary movement of the hub and lower. race member, the upper end of the standard being outwardly cuppedto forni a seat for the bearingassembly, and clamping f means engaged about the cupped portion of the standard and the-bearing assembly to prevent aration of theparts. y l

11. A 1li-)ansias comprising avisar-laad, a lifting member, a driving gear formed with a downwardly extending hollow hub through which the lifting member is'vertically'lmovable, vdriving connections between the hub and lifting member, a bearing assembly com- .5 prising a pair of annular race members adapted to engage about the huband an annular series of antifriction members interposed between the races, means for locking the bearing assembly on the hub while perl( mitting relative rotary movement of the hub and lower race member, the upper end of the standard being outwardly cupped to form a seat for the bea-ring assembly, and an annular locking collar adapted to surround the 'n cupped upper end of the standard, the collar having an lnwardly ianged upper end to engage over the upper race member and a plurality of ears on its lower end to be clamped under the cupped portion of the standard.

g 12. A lifting jack comprising a standard, a 4

lifting member, a driving gear formed with a downwardl f extending hollow hub through which the li ing member is vertically movable, driving connections between the hub 25 and lifting member, a bearing assembly comprising a pair of annular race members adapted to engage about the hub and an annular series 0i' antifriction members interposed between the races, the lower end of the 30 hub bein'g riveted outwardly to hold the bearing assembly on the hub while permitting relative rotary movement of the hub and lower race member, the upper end of the standard being outwardly cupped to form a 35 seat for the bearing assembly,l and clamping means engaged about the cupped portion of the standard and the bearing assembly to prevent separation of the parts. 13. A lifting jack comprising a standard,

m a lifting member, a driving gear formed with a downwardly extending hollow hub through which the lifting member is vertically movable, driving connections between the hub and lifting member, a bearing assembly com- 5 prising apair of annular race members adapted to engage about the hub and an annular series of antifriction members interposed between the races,'the lower end of the hub being riveted outwardly to hold the go bearing assembly on the hub while permitting relative rotary movement of the hub and lower race member, the upper end ofv the standard being outwardly cupped to form a seat for the bearing assembly, and an annular 55 locking collar adapted to surround the cupped upper end of the standard, the collar having an inwardly flanged upper end to engage over the upper race member and a plurality of ears on its lower end to be clamped 30 under the cupped portion of the standard.

' JOSEPH J. MIZER. 

